Pulverizing or grinding mill.



7 0 9 1 9 R A D E T N E T A P PULVERIZING OR GRINDING MILL.

APPLICATION FILED MAR.13, 1906.

2 SHEETSQSHEET 1.

PATENTED APR. 9, 1907.

J. W. FULLER, JR. PULVERIZING OR GRINDING MILL.

APPLICATION FILED MAR. 13, 1906.

2 SHEETS-$113111 2.

UNITED STATES PATENT oEEIoE.

JAMES W. FULLER, JR-.,-%OE1GATASAUQUA, PENNSYLVANIA.

PULVERIZING OR GRINDING MILL.

To all whom, 1 2 may concern.-

Be it known that 1, JAMES W. FULLER, Jr.,

a citizen of the United States, residing at ing parts of the mill from the direct impact ofmaterial tobe bolted.

'Thenature and sec tion will be more ful y understood from the following description, taken in connection with the accom anying drawings, forming part hereof, in w 1ich-- Figure 1 is a View illustrating partly in vertical central section and partly in elevation a pulverizing or grinding mill. and also showing the arrangement of the finishing and protecting screens therein, the manner of securing the screens to the mill, the space or chamber formed between the screens, and the outlet for the same to permit coarse material retained by the outer finishingscreen to pass back into contact with the grinding mechanism of the mill, all embodying characteristic main features of my said invention. Fig. 2 is a horizontal sectional View of the upper portion of the mill, certain parts being removed therefrom and illustrating the arrangement of the finishing and protecting screens, the division ofthe protecting-screeninto sections, and the manner of connecting the screen-sections to posts formed in the upper portion of the casing of the mill. Fig. 3 1s a detail view, enlarged, illustrating in elevation one of the sections of the rotecting-screen, a frame and a bar surroum ing the Same, and the manner of forming an opening at the lower portion of the screen-section; and Fig. 4 1s a vertlcal sectional view of the screen-section shown in Fig. 3 and also illustrating the manner of connecting the vertical screen members to the frame and to a rod carried by the same.

Referring to the drawings, a represents the bed-plate of the pulverizing or grinding mill, to which is Secured a standard a, supporting a sectional casing I). The casing serves to Specification of. Letters Patent. I

Application filed March 13,1906. Serial No. 305,73.

e of my present inven- Patented April 9, 1907.

support a casing or housing 0, which is formed by an annular base portion 0, connected by posts c? with an annular head portion 0 The head portion 0 is closed by a removable plate d, carrying the upper bearing (1 for a driving-shaft e, the lower bearing 11 of which is carried by the base-plate a. The base and head portions 0 and c of the casing c, in conjunction. with the posts 0 preferably formed integral therewith, form a series of openings 0 which are closed by sections of coarse-meshed stron wire Screens g, held in position flush with t e inner surface of the posts 0 by the following preferred mechanism.

As shown in Fig, 3, the sections of the screens g are surrounded at both sides and at the upper portion by aninverted-U-shaped frame h, consistin of a fiat strip of metal,

which at a certain istance above its free ends i is provided with a bar or rod h.

secured to the'sides of the frame h adj acent to the inner edge thereof, while the vertical strands of the wire 9 are similarly secured to the upper portion of the frame h and rod h. When theframe h with the screen 9 mounted therein is inserted in one of the openings. 0, formed in the-casing c, the same fits closely therein and permits of a ready connection with the posts a by bolts or screws 9 passing through openings learranged in the sides .of

the frame It. The screen 9, not extending to the lower end of the frame 7t, forms, in conjunction with the rod It and the respective base portions 0' of the casing c, an oblong opening 7L3, which communicates-with the interior chamber 1', formed by the casing c and screens g, closing the openings 0 The Screens 9 serve protecting means for a finemeshed wire screen 7t, which surrounds the exterior of the casing c and is connected therewith beyond the openings 0 preferably by bands 0 clamping the upper and lower ends thereof to thecasing c. This screen 76 in conjunction with the screens 9 form a charm her it in each of the openings 0 of the casing c, which by means of the outlet h are in open communication with the chamber i for a purpose to be presently more full 1 explained A certaln distance beyon the screen It the casing c is surrounded by a casing t, preferably formed of sheet metal, which forms an outer annular chamber m, commu- I The hori- 'zontal strands g of the wire of the screen g are nicating by ducts m with a chamber n, ar

by rolls or balls p, traveling within the same, is raised or elevated in the chamber in by the rotation of obliquely-arranged wings orvanes r, the same is forcibly thrown against, the inner; screens g. These screens, although permitting of the ready passage of the material therethrough, nevertheless takeu'p and neutralize the force of the impact, so that the material which has to cross thechainber k in order to reach the screen k strikes this screen with considerably less force than would be the case were the screens 9 and 7c placed side by side. The material of sufiicient fineness is forced through the meshes of the screen k by the current of air generated in the chamber qlthrou h the intervention of the wings or vanes r, w 'le the material of less fineness, not passing the screen 70, descends, in the chamber h, and from thence it is conducted through the outlet it directly into the part of thegrinding-surface of the ring 0 and between the .same and grinding-balls for further grinding thereof. The materia assing the finishing-screen k and entering t e collecting-chamber m is conducted by the ducts m into the chamber n, from which the same is discharged through aspout s by the interventionof a revolving platform t, as shown in Fig. 1.

'Havingthus described the nature and objects of my invention, what I claim as new, and desire to secure by Letters-Patent, is

The combination, in a pulverizing or grinding mill, of a grinding-ring, balls operatively engaging and maintaine said ring, a housing provided with'openings, a fine screen and sectional coarse screens, said fine screen surrounding said housing, and said sectional coarse screens fitting the openings of said housing and two series of rotatable wings or blades supported above said grinding means at different angles to each witnesses.

JAMES W. FULLER, JR. Witnesses A. N. ULRICH, BESSIE MoMAHoN.

in' contact with i 

